PHP抓取网页内容的几种方法

方法1: 用file_get_contents 以get方式获取内容
<?php
$url='http://www.domain.com/?para=123';
$html = file_get_contents($url);
echo $html;
?> 

方法2：用file_get_contents函数,以post方式获取url
<?php
$url = 'http://www.domain.com/test.php?id=123';
$data = array ('foo' => 'bar');
$data = http_build_query($data); 

$opts = array (
'http' => array (
   'method' => 'POST',
   'header'=> "Content-type: application/x-www-form-urlencoded\r\n" .
                     "Content-Length: " . strlen($data) . "\r\n",
   'content' => $data
)
);
$ctx = stream_context_create($opts);
$html = @file_get_contents($url,'',$ctx); 

如果需要再传递cookie数据,则把
'header'=> "Content-type: application/x-www-form-urlencoded\r\n" .
                  "Content-Length: " . strlen($data) . "\r\n",
修改为
'header'=> "Content-type: application/x-www-form-urlencoded\r\n" .
                 "Content-Length: " . strlen($data) . "\r\n".
                 "cookie:cookie1=c1;cookie2=c2\r\n" ;
即可 

方法3: 用fopen打开url, 以get方式获取内容
<?php
$fp = fopen($url, 'r');
$header = stream_get_meta_data($fp);//获取报头信息
while(!feof($fp)) {
$result .= fgets($fp, 1024);
}
echo "url header: {$header} <br>":
echo "url body: $result";
fclose($fp);
?> 

方法4: 用fopen打开url, 以post方式获取内容
<?php
$data = array ('foo2' => 'bar2','foo3'=>'bar3');
$data = http_build_query($data); 

$opts = array (
'http' => array (
'method' => 'POST',
'header'=> "Content-type: application/x-www-form-urlencoded\r\nCookie:cook1=c3;cook2=c4\r\n" .
"Content-Length: " . strlen($data) . "\r\n",
'content' => $data
)
); 

$context = stream_context_create($opts);
$html = fopen('http://www.test.com/zzzz.php?id=i3&id2=i4','rb' ,false, $context);
$w=fread($html,1024);
echo $w;
?> 

方法5：用fsockopen函数打开url，以get方式获取完整的数据，包括header和body
<?php
function get_url ($url,$cookie=false)
{
$url = parse_url($url);
$query = $url[path]."?".$url[query];
echo "Query:".$query;
$fp = fsockopen( $url[host], $url[port]?$url[port]:80 , $errno, $errstr, 30);
if (!$fp) {
return false;
} else {
$request = "GET $query HTTP/1.1\r\n";
$request .= "Host: $url[host]\r\n";
$request .= "Connection: Close\r\n";
if($cookie) $request.="Cookie:   $cookie\n";
$request.="\r\n";
fwrite($fp,$request);
while(!@feof($fp)) {
$result .= @fgets($fp, 1024);
}
fclose($fp);
return $result;
}
}
//获取url的html部分，去掉header
function GetUrlHTML($url,$cookie=false)
{
$rowdata = get_url($url,$cookie);
if($rowdata)
{
$body= stristr($rowdata,"\r\n\r\n");
$body=substr($body,4,strlen($body));
return $body;
} 

   return false;
}
?> 

方法6：用fsockopen函数打开url，以POST方式获取完整的数据，包括header和body
<?php
function HTTP_Post($URL,$data,$cookie, $referrer="")
{ 

   // parsing the given URL
$URL_Info=parse_url($URL); 

   // Building referrer
if($referrer=="") // if not given use this script as referrer
$referrer="111"; 

   // making string from $data
foreach($data as $key=>$value)
$values[]="$key=".urlencode($value);
$data_string=implode("&",$values); 

   // Find out which port is needed - if not given use standard (=80)
if(!isset($URL_Info["port"]))
$URL_Info["port"]=80; 

   // building POST-request:
$request.="POST ".$URL_Info["path"]." HTTP/1.1\n";
$request.="Host: ".$URL_Info["host"]."\n";
$request.="Referer: $referer\n";
$request.="Content-type: application/x-www-form-urlencoded\n";
$request.="Content-length: ".strlen($data_string)."\n";
$request.="Connection: close\n"; 

   $request.="Cookie:   $cookie\n"; 

   $request.="\n";
$request.=$data_string."\n"; 

   $fp = fsockopen($URL_Info["host"],$URL_Info["port"]);
fputs($fp, $request);
while(!feof($fp)) {
$result .= fgets($fp, 1024);
}
fclose($fp); 

   return $result;
} 

?> 

方法7:使用curl库，使用curl库之前，可能需要查看一下php.ini是否已经打开了curl扩展
<?php
$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, 'http://www.domain.com/');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch); 

echo $file_contents;
?>